FBI Special Agent Aloysius Pendergast, wounded in a fight with a mystical creature on the seashore, disappears into the waves. Constance, the agent's assistant and ward, having not heard from him, decides that he drowned. In desperation, she retreats to the underground chambers of a mansion on Riverside Drive, but is kidnapped by a man long believed to be dead. This hoaxer has a compelling reason for revenge, and he has nurtured his cruel plan for decades... Constance finds herself alone with her kidnapper on the remote island of Idyll. She knows a lot about him, but not everything... The main secret lies here, behind the door of the obsidian room. For the first time in Russian!